Fetchmail Fetchmail is a free, full-featured, robust, well-documented remote-mail retrieval and forwarding utility intended to be used over on-demand TCP/IP links (such as SLIP or PPP connections).

maildrop - mail delivery agent with filtering Maildrop reads a mail message from standard input, then delivers the message to your mailbox. maildrop will optionally read instructions from a file, which describes how to filter incoming mail. Instructions can be provided having mail delivered to alternate mailboxes, or forwarded using a structured filtering language.

Muttils Provides Python a list of tools to facilitate the use of mail clients.

Pygmy A GNOME mail client written in Python. Pygmy supports attachments and MIME messages, both in the message composer and in the message viewer.

Vacation Auto-Reply (Unix) Simple instructions for one variant of the vacation(1) program on Unix. (This doesn't appear to be the most standard version, but the general instructions look relatively ok.)